JP2021005653A - Electromagnet device, shock absorber, and moving body - Google Patents

Abstract

To provide an electromagnet device capable of ensuring sealing performance without providing a sealing member such as an O-ring, a shock absorber equipped with the electromagnet device, and a moving body.SOLUTION: An electromagnet device 1 includes a tubular housing 2, a bobbin 3 housed in the housing 2 and having a tubular portion 30, and a coil 4 wound around the tubular portion 30. The electromagnet device 1 further includes a fixed iron core 5 arranged on one side of the tubular portion 30 in the axial direction, and a movable iron core 6 that is housed in the tubular portion 30, and moves along the axial direction of the tubular portion 30 by a magnetic field generated when the coil 4 is energized. The fixed iron core 5 is welded to the inner peripheral surface of the housing 2 over the entire circumference.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to an electromagnet device, a shock absorber and a moving body, and more particularly to an electromagnet device for moving a movable iron core by an electromagnetic force of a coil, and a shock absorber and a moving body provided with the electromagnet device.

A moving body such as an automobile may be equipped with a suspension device that changes the damping force characteristics by electronic control. In the suspension device, the damping force characteristics change when the valve in the shock absorber is moved by the electromagnet device.

As an electromagnet device of this type, for example, an electromagnet device included in the solenoid valve described in Patent Document 1 is known.

The electromagnet device includes a bobbin, a coil wound around the bobbin, a core and a yoke inserted in the bobbin, and a plunger movable between the core and the yoke. A valve chamber is formed on the outside of the yoke (opposite the plunger), and oil flows into the valve chamber.

JP-A-2002-333077

By the way, in the electromagnet device having a valve chamber into which oil flows, which is described in Patent Document 1 and the like, it is necessary to provide a sealing member such as an O-ring so that oil does not flow into unnecessary parts.

When the seal member is provided, the structure may be complicated due to the arrangement of the seal member, or the sealability may be deteriorated due to misalignment of the seal member, deterioration of the seal member, or the like.

In view of the above circumstances, it is an object of the present disclosure to provide an electromagnet device capable of ensuring sealing performance without providing a sealing member such as an O-ring, a shock absorber equipped with the electromagnet device, and a moving body. To do.

The electromagnet device according to one aspect of the present disclosure includes a tubular housing, a bobbin housed in the housing and having a tubular portion, and a coil wound around the tubular portion. The electromagnet device according to one embodiment further includes a fixed iron core arranged on one side of the tubular portion in the axial direction and a magnetic field housed in the tubular portion and generated when the coil is energized along the axial direction of the tubular portion. It is equipped with a movable iron core that moves. The fixed iron core is welded to the inner peripheral surface of the housing over the entire circumference.

The shock absorber according to one aspect of the present disclosure includes the electromagnet device and a damping mechanism that generates a damping force of a magnitude corresponding to the movement of the movable iron core of the electromagnet device.

The moving body according to one aspect of the present disclosure includes the shock absorber and a main body provided with the shock absorber.

In the electromagnet device according to one aspect of the present disclosure, the sealing property can be ensured without providing a sealing member such as an O-ring.

Further, the shock absorber and the moving body according to one aspect of the present disclosure can be configured to be provided with an electromagnet device capable of ensuring sealing performance without providing a sealing member such as an O-ring.

FIG. 1 is a cross-sectional view showing an electromagnet device of one embodiment. FIG. 2 is an enlarged cross-sectional view showing a portion A of the electromagnet device of the above. FIG. 3 is a cross-sectional view showing how the movable iron core of the electromagnet device described above has moved. FIG. 4 is an exploded perspective view showing the electromagnet device of the same. FIG. 5 is a block diagram showing a shock absorber having the same electromagnet device. FIG. 6 is a schematic view showing a moving body including the shock absorber of the same.

1. 1. Outline The electromagnet device 1 of the present embodiment shown in FIG. 1 includes a tubular housing 2, a bobbin 3 housed in the housing 2 and having a tubular portion 30, a coil 4 wound around the tubular portion 30, and the like. To be equipped with. The electromagnet device 1 is further housed in a fixed iron core 5 arranged on one side of the tubular portion 30 in the axial direction and in the tubular portion 30, and moves along the axial direction of the tubular portion 30 by a magnetic field generated when the coil 4 is energized. The movable iron core 6 and the like are provided. The fixed iron core 5 is welded to the inner peripheral surface of the housing 2 over the entire circumference.

In the electromagnet device 1 of the present embodiment having the above configuration, the fixed iron core 5 and the housing 2 can be sealed by welding the fixed iron core 5 to the inner peripheral surface of the housing 2 over the entire circumference. As a result, in the electromagnet device 1 of the present embodiment, the sealing property can be ensured without providing a sealing member such as an O-ring between the fixed iron core 5 and the housing 2.

Further, the shock absorber 101 of the present embodiment shown in FIG. 5 has the above-mentioned electromagnet device 1 and a damping mechanism 13 that generates a damping force of a magnitude corresponding to the movement of the movable iron core 6 of the electromagnet device 1.

By providing the above configuration, the shock absorber 101 of the present embodiment can be configured to include an electromagnet device 1 capable of ensuring sealing performance without providing a sealing member such as an O-ring.

Further, the moving body 100 of the present embodiment shown in FIG. 6 includes the shock absorber 101 described above and a main body 102 provided with the shock absorber 101.

By providing the above configuration, the moving body 100 of the present embodiment can be configured to include an electromagnet device 1 capable of ensuring sealing performance without providing a sealing member such as an O-ring.

2. 2. Details Subsequently, each of the electromagnet device 1 of the present embodiment shown in FIGS. 1 to 4, the shock absorber 101 of the present embodiment shown in FIG. 5, and the moving body 100 of the present embodiment shown in FIG. 6 will be described in more detail. To do. It should be noted that each figure is a schematic view, and the ratio of the size and the thickness of each component in the figure does not necessarily reflect the actual dimensional ratio.

2-1. Electromagnet device The electromagnet device 1 shown in FIG. 1 includes a cap 7, a seal ring 8, a shaft 9, a pair of bearing members 10, and a lid, in addition to a housing 2, a bobbin 3, a coil 4, a fixed iron core 5, and a movable iron core 6. 11 and a pair of terminal members 12 (see FIG. 4).

In the following, with reference to the assembled electromagnet device 1 shown in FIG. 1, the axial direction of the tubular portion 30 of the bobbin 3, that is, the direction in which the fixed iron core 5 and the movable iron core 6 are aligned is defined as the vertical direction. Each configuration will be described by defining the side on which the movable core 6 is located with respect to the fixed core 5 as the upper side. However, the definition of this direction does not limit the usage pattern of the electromagnet device 1.

As shown in FIGS. 1 and 4, the housing 2 has a tubular peripheral wall portion 20 and an annular partition wall 21 that projects inward from the peripheral wall portion 20 and is viewed in the axial direction (that is, the vertical direction) of the tubular portion 30. And have. The inner peripheral surface 22 of the partition wall 21 is the surface to which the fixed iron core 5 is welded. A fixed iron core 5 is welded to the inner peripheral surface 22 over the entire circumference. In the present embodiment, the peripheral wall portion 20 has a cylindrical shape. The partition wall 21 has an annular plate shape that protrudes inward from a part of the peripheral wall portion 20 in the axial direction (vertical direction).

Of the partition wall 21, the surface 23 (that is, the lower surface) facing the opposite side of the movable iron core 6 in the axial direction (vertical direction) and the side of the fixed iron core 5 opposite to the movable iron core 6 in the axial direction (vertical direction). The surface 54 facing the surface is flush with each other. The flush surface here is not limited to a perfect flush surface, but also includes a substantially flush surface having a slight step (for example, within 0.2 mm). The surface 23 of the partition wall 21 is a flat surface.

The partition wall 21 has a circular through hole 24 penetrating in the vertical direction in the central portion thereof. The central axis of the through hole 24 and the central axis of the peripheral wall portion 20 coincide with each other. In the present embodiment, the through hole 24 has a diameter at the lower end portion larger than the diameter at the other portion. Therefore, as shown in FIG. 2, the inner peripheral surface 22 of the partition wall 21 includes a first inner peripheral surface 220 located at the lower end and a stepped surface 221 extending radially inward from the upper end of the first inner peripheral surface 220. It has a second inner peripheral surface 222 extending upward from the inner peripheral edge of the stepped surface 221.

Each of the first inner peripheral surface 220 and the second inner peripheral surface 222 faces inward in the radial direction (direction toward the central axis of the through hole 24), and the stepped surface 221 is on the lower side (what is the movable iron core 6? The opposite side). The stepped surface 221 is an annular flat surface when viewed from below (viewed in the axial direction), and is parallel to the surface 23 (lower surface) of the partition wall 21. The first inner peripheral surface 220 and the second inner peripheral surface 222 are parallel to the central axis of the through hole 24.

As shown in FIGS. 1 and 4, the peripheral wall portion 20 has a portion 25 above the partition wall 21 and a portion 26 below the partition wall 21. The inner peripheral surface of the upper portion 25 is located radially outside the inner peripheral surface of the lower portion 26. The inner peripheral surface of the upper portion 25 has a stepped surface 250 at its upper end.

In the housing 2, the internal space below the partition wall 21 is the first oil storage portion S1 in which oil is stored. In other words, in the housing 2, the internal space on the side opposite to the movable iron core 6 with the fixed iron core 5 sandwiched in the axial direction is the first oil accommodating portion S1 in which the oil is stored. The first oil accommodating portion S1 is a space surrounded by the lower portion 26 of the peripheral wall portion 20 and the partition wall 21.

The space above the partition wall 21 of the housing 2 accommodates a bobbin 3, a coil 4, a movable iron core 6, a cap 7, a seal ring 8, a shaft 9, at least one of a pair of bearing members 10, and a lid 11. It is a space. A part (lower part) of the shaft 9 is housed in the storage space S2.

The bobbin 3 is made of, for example, a synthetic resin. The bobbin 3 has a tubular portion 30 and a pair of flange portions 31. The tubular portion 30 is formed in a cylindrical shape with both ends open in the vertical direction. The pair of flange portions 31 project from both ends of the tubular portion 30 in the vertical direction toward the outer side in the radial direction of the tubular portion 30. Each of the pair of collar portions 31 is formed in the shape of an annular plate. The bobbin 3 further has a mounting portion 32 to which a pair of terminal members 12 are mounted. The mounting portion 32 projects upward from a part of the upper flange portion 31 in the circumferential direction.

The coil 4 is a multi-layer coil composed of a lead wire 40 wound around a tubular portion 30 of the bobbin 3. The lead wire 40 is made of a metal wire whose surface is insulated. Both ends of the lead wire 40 are pulled out to the upper side of the bobbin 3 and are electrically and mechanically connected to the pair of terminal members 12, respectively.

Each of the pair of terminal members 12 is a metal piece made of a conductive metal material (for example, copper or the like). Each of the pair of terminal members 12 is formed by bending a metal plate or the like. The pair of terminal members 12 are attached by inserting their lower ends into the attachment portion 32.

One end of the lead wire 40 is connected to the lower end of one terminal member 12 of the pair of terminal members 12, and the other end of the lead wire 40 is connected to the lower end of the other terminal member 12. A control device 103, which will be described later, is electrically and mechanically connected to the pair of terminal members 12 via a harness or the like. The energization of the coil 4 is controlled by the control device 103.

The cap 7 is a member arranged on the side opposite to the fixed iron core 5 in the axial direction of the tubular portion 30 of the bobbin 3. The cap 7 is formed in a bottomed cylindrical shape with an open lower end. The cap 7 is made of, for example, electromagnetic soft iron. The cap 7 may be made of a magnetic material such as iron.

In the present embodiment, the cap 7 has a cylindrical cap cylinder portion 70 housed in the cylinder portion 30 and a protruding portion 71 that protrudes upward from the cap cylinder portion 70 and is arranged above the cylinder portion 30. Have. The cap cylinder portion 70 has a first portion 72 having a small inner diameter to which the bearing member 10 is attached, and a second portion 73 having a larger inner diameter than the first portion 72 and accommodating the movable iron core 6 so as to be movable. The first portion 72 and the second portion 73 have the same outer diameter.

As shown in FIG. 2, the outer peripheral surface 730 of the second portion 73 includes a first outer peripheral surface 731 located at the lower end portion, a stepped surface 732 extending radially outward from the upper end of the first outer peripheral surface 731, and a stepped surface. It has a second outer peripheral surface 733 extending upward from the outer peripheral edge of the 732.

Each of the first outer peripheral surface 731 and the second outer peripheral surface 733 is a surface facing outward in the radial direction, and the stepped surface 732 is a surface facing downward. The step surface 732 is an annular plane when viewed from below (viewed in the axial direction).

An accommodating portion 710 capable of accommodating the upper end portion of the shaft 9 is provided below the projecting portion 71. The accommodating portion 710 communicates with the space inside the first portion 72 of the cap cylinder portion 70. The outer diameter of the protruding portion 71 is smaller than the outer diameter of the cap cylinder portion 70.

The seal ring 8 is a tubular member that connects the cap 7 and the fixed iron core 5. As shown in FIGS. 1 and 4, the seal ring 8 is formed in a cylindrical shape with both ends open in the vertical direction. The seal ring 8 is made of a non-magnetic metal material such as stainless steel.

As shown in FIG. 2, the outer diameter of the outer peripheral surface 80 of the seal ring 8 is substantially the same as the outer diameter of the second outer peripheral surface 733 of the second portion 73 of the cap cylinder portion 70 of the cap 7, and the bobbin 3 It is slightly smaller than the inner diameter of the tubular portion 30 of.

The inner diameter of the inner peripheral surface 81 of the seal ring 8 is the same as the outer diameter of the first outer peripheral surface 731 of the second portion 73 of the cap cylinder portion 70 of the cap 7. The upper end surface 82 of the seal ring 8 is an annular flat surface, and has a shape and dimensions corresponding to the stepped surface 732 of the cap 7. The lower end surface 83 of the seal ring 8 is an annular flat surface, and has a shape and dimensions corresponding to the stepped surface 53 of the fixed iron core 5, which will be described later.

As shown in FIGS. 1 and 4, the fixed iron core 5 has a cylindrical main body portion 50, a flange portion 51 protruding radially outward from the lower end portion of the main body portion 50, and an upward protrusion from the upper surface of the main body portion 50. It has a cylindrical tubular portion 52 and a cylindrical portion 52. The fixed iron core 5 is made of, for example, electromagnetic soft iron. The fixed iron core 5 may be formed of a magnetic material such as iron.

As shown in FIG. 2, the outer diameter of the outer peripheral surface 500 of the main body 50 is the same as the inner diameter of the second inner peripheral surface 222 of the partition wall 21 of the housing 2. A bearing member 10 is attached to the inner peripheral surface of the main body 50.

The outer diameter of the outer peripheral surface 520 of the tubular portion 52 is the same as the inner diameter of the inner peripheral surface 81 of the seal ring 8. The outer peripheral surface 520 of the tubular portion 52 is continuous with the outer peripheral surface 500 of the main body portion 50 via a stepped surface 53 which is an outer peripheral edge portion of the upper surface of the main body portion 50. The inner diameter of the inner peripheral surface of the tubular portion 52 is larger than the outer diameter of the movable iron core 6.

Each of the outer peripheral surface 500 and the outer peripheral surface 520 is a surface facing outward in the radial direction, and the stepped surface 53 is a surface facing upward. The step surface 53 is an annular plane when viewed from above (viewed in the axial direction). The stepped surface 53 has a shape and dimensions corresponding to the lower end surface 83 of the seal ring 8.

The flange portion 51 has a shape corresponding to a recess in the inner peripheral surface 22 of the partition wall 21 (specifically, a space surrounded by the stepped surface 221 and the first inner peripheral surface 220). The flange portion 51 has an upper surface 510 in contact with the stepped surface 221 and an outer peripheral surface 511 in contact with the first inner peripheral surface 220.

Of the fixed cores 5, the surface 54 (that is, the lower surface) facing the side opposite to the movable core 6 in the axial direction (vertical direction) is a flat surface. In other words, the lower surfaces of the main body portion 50 and the flange portion 51 are flat surfaces.

Each of the cap 7 and the fixed iron core 5 is welded to the seal ring 8 over the entire circumference. Specifically, the stepped surface 732 of the cap 7 and the upper end surface 82 of the seal ring 8 are welded over the entire circumference, and the stepped surface 53 of the fixed iron core 5 and the lower end surface 83 of the seal ring 8 are welded over the entire circumference. Welding is performed, for example, by laser welding.

By joining the cap 7, the seal ring 8 and the fixed iron core 5 by welding, a space surrounded by the cap 7, the seal ring 8 and the fixed iron core 5 is formed. The space surrounded by the cap 7, the seal ring 8, and the fixed iron core 5 is the second oil accommodating portion S3 in which the oil is accommodating. A movable iron core 6 is arranged in this space (second oil accommodating portion S3).

As shown in FIGS. 1 and 4, the movable iron core 6 has a cylindrical shape. The movable iron core 6 is made of electromagnetic soft iron. The movable iron core 6 may be formed of a magnetic material such as iron. The movable iron core 6 is arranged so as to face the lower surface of the first portion 72 of the cap 7 in the vertical direction in the space (second oil accommodating portion S3) surrounded by the cap 7, the seal ring 8, and the fixed iron core 5. It is movable in the vertical direction.

The movable iron core 6 is formed with a through hole 60 penetrating in the vertical direction at the center thereof. The shaft 9 is passed through the through hole 60.

The shaft 9 is a tubular member provided integrally with the movable iron core 6. In the present embodiment, the shaft 9 is formed in a circular tubular shape having a longitudinal direction in the vertical direction. The shaft 9 is made of a non-magnetic material such as stainless steel.

The shaft 9 is provided with a pair of through holes 90 that penetrate the peripheral wall of the shaft 9 in the radial direction at the lower portion (a portion supported by the lower bearing member 10). The first oil accommodating portion S1 and the second oil accommodating portion S3 are connected to each other through the inside of the shaft 9.

Each of the pair of bearing members 10 is provided in a cylindrical shape. Each of the pair of bearing members 10 is formed of, for example, an extremely low carbon steel material (ordinary steel). One of the pair of bearing members 10 is attached to the inner peripheral surface of the first portion 72 of the cap 7, and the other is attached to the inner peripheral surface of the main body 50 of the fixed iron core 5.

The shaft 9 is supported so as to be movable in the vertical direction by a pair of bearing members 10 in a state where the displacement of the central shaft is regulated.

The lid 11 is made of a magnetic material such as iron. The lid 11 is attached to the opening at the upper end of the housing 2 to position the bobbin 3 in the housing 2.

In this embodiment, the lid 11 has a disk shape. The lid 11 has a through hole 110 through which the protruding portion 71 of the cap 7 passes, a through hole 111 through which the mounting portion 32 of the bobbin 3 passes, and a plurality of through holes 112 located at intervals in the circumferential direction in the vertical direction. It is provided so as to penetrate through.

The lid 11 is attached to the upper end portion of the housing 2 in a state where the outer peripheral portion of the lower surface thereof touches the stepped surface 250 of the housing 2.

Subsequently, a method of assembling the electromagnet device 1 of the present embodiment will be described.

First, the fixed iron core 5, the movable iron core 6, the cap 7, the seal ring 8, the shaft 9, and the pair of bearing members 10 shown in FIG. 4 are combined so as to have the arrangement shown in FIG. In the combined state, the shaft 9 and the movable iron core 6 are integrated, and the upper and lower ends of the shaft 9 are supported by a pair of bearing members 10 so as to be movable in the vertical direction.

Further, in this combined state, as shown in FIG. 2, the upper end portion of the inner peripheral surface 81 of the seal ring 8 is in contact with the first outer peripheral surface 731 of the cap 7 over the entire circumference, and the lower end portion of the inner peripheral surface 81 of the seal ring 8 is in contact with the entire circumference. Is in contact with the outer peripheral surface 520 of the tubular portion 52 of the fixed iron core 5 over the entire circumference. Then, the upper end surface 82 of the seal ring 8 is in contact with the stepped surface 732 of the cap 7, and the lower end surface 83 of the seal ring 8 is in contact with the stepped surface 53 of the fixed iron core 5.

In this state, a laser beam is applied to the contact portion between the upper end surface 82 of the seal ring 8 and the stepped surface 732 of the cap 7 over the entire circumference to perform laser welding. Further, a laser beam is applied to the contact portion between the lower end surface 83 of the seal ring 8 and the stepped surface 53 of the fixed iron core 5 over the entire circumference to perform laser welding.

In the present embodiment, since the first outer peripheral surface 731 of the cap 7 and the outer peripheral surface 520 of the fixed iron core 5 are inside the upper and lower end faces 82 and 83 of the seal ring 8 in the radial direction, the laser beam reaches unnecessary portions. It is possible to prevent laser welding.

By laser welding as described above, the cap 7, the seal ring 8, and the fixed iron core 5 are joined in a state where the sealing property is ensured. As a result, a unit in which the fixed iron core 5, the movable iron core 6, the cap 7, the seal ring 8, the shaft 9, and the pair of bearing members 10 are integrated is formed.

Next, this unit, the housing 2, the bobbin 3, and the lid 11 are combined. As the bobbin 3, as shown in FIG. 4, a bobbin 3 in which a coil 4 is wound and a pair of terminal members 12 are attached is used.

First, the unit is inserted into the through hole 24 of the partition wall 21 of the housing 2 from below. The unit is positioned in the vertical direction in the housing 2 when the upper surface 510 of the flange portion 51 of the fixed iron core 5 hits the stepped surface 221 of the partition wall 21. Further, in the unit, the outer peripheral surface 500 of the fixed iron core 5 is in contact with the second inner peripheral surface 222 of the partition wall 21, and the outer peripheral surface 511 of the flange portion 51 of the fixed iron core 5 is in contact with the first inner peripheral surface 220 of the partition wall 21. ..

In this state, laser welding is performed by irradiating the contact portion between the outer peripheral surface 511 of the flange portion 51 of the fixed iron core 5 and the first inner peripheral surface 220 of the partition wall 21 from below with a laser beam.

In the present embodiment, since the stepped surface 221 of the partition wall 21 is located above the outer peripheral surface 511 of the flange portion 51 of the fixed iron core 5, it is possible to prevent the laser beam from reaching an unnecessary portion and being laser welded. Can be done.

Next, the bobbin 3 is inserted through the upper end opening of the housing 2, and the unit is inserted into the tubular portion 30 of the bobbin 3.

Next, the lid 11 is attached to the upper end opening of the housing 2. At this time, the protruding portion 71 of the cap 7 is passed through the through hole 110 of the lid 11, and the pair of terminal members 12 and the mounting portion 32 of the bobbin 3 are passed through the through hole 111 of the lid 11. The lid 11 is attached to the housing 2 with the outer peripheral edge of the lower surface of the lid 11 in contact with the stepped surface 250 of the housing 2.

By attaching the lid 11 to the housing 2, the position of the bobbin 3 in the housing 2 is fixed. The lid 11 is fixed to the housing 2 by a fixing tool such as a screw or an appropriate means such as adhesion.

By assembling as described above, the electromagnet device 1 shown in FIG. 1 is formed.

Subsequently, the operation of the electromagnet device 1 of the present embodiment will be briefly described.

When the coil 4 is energized, the coil 4 generates a magnetic field, and the movable core 6 and the fixed core 5 are excited. When the movable core 6 and the fixed core 5 are excited, a magnetic attraction force is generated between the movable core 6 and the fixed core 5. As shown in FIG. 3, this magnetic attraction causes the movable core 6 to move downward so as to be attracted to the fixed core 5. As the movable iron core 6 moves downward, the shaft 9 also moves downward. As the shaft 9 moves downward, the amount of protrusion of the shaft 9 downward from the fixed iron core 5 increases.

The electromagnet device 1 of the present embodiment is connected to a cylinder 130 described later of the damping mechanism 13, whereby oil flows into the first oil accommodating portion S1. The oil that has flowed into the first oil accommodating portion S1 flows into the inside of the shaft 9 through the opening at the lower end of the shaft 9 and the pair of through holes 90, passes through the inside of the shaft 9, and flows into the second oil accommodating portion S3. To do. As a result, the space in which the movable iron core 6 moves up and down (second oil accommodating portion S3) is filled with oil, and damping of the movable iron core 6 can be suppressed. The oil in the second oil accommodating portion S3 can flow out to the first oil accommodating portion S1 through a slight gap between the shaft 9 and the lower bearing member 10.

2-2. Shock absorber The shock absorber 101 shown in FIG. 5 is used for a suspension in combination with a spring. The shock absorber 101 includes the above-mentioned electromagnet device 1 and a damping mechanism 13.

The damping mechanism 13 includes a cylinder 130, a piston 131, a piston rod 132, and a damping valve 133. The cylinder 130 is filled with oil. The piston 131 is inserted into the cylinder 130 so as to be reciprocating, and divides the inside of the cylinder 130 into an extension side chamber and a compression side chamber. The piston rod 132 is inserted into the cylinder 130 so as to be able to advance and retreat, and is connected to the piston 131. The damping valve 133 is provided in the flow path of oil that goes back and forth between the extension side chamber and the compression side chamber as the piston rod 132 moves back and forth, and generates a damping force by imparting resistance to the oil flow.

In the electromagnet device 1, the lower end of the housing 2 is connected to the cylinder 130, and the damping mechanism 13 is attenuated by changing the open / closed state of the damping valve 133 according to the magnitude of the current flowing when the coil 4 is energized. Change the force. In other words, the damping valve 133 is configured so that the open / closed state changes according to the movement of the movable iron core 6 of the electromagnet device 1.

The electromagnet device 1 is provided in the cylinder 130 in a state of being inserted into the piston rod 132 of the damping mechanism 13. That is, in the shock absorber 101 of the present embodiment, the electromagnet device 1 is built in the damping mechanism 13.

2-3. Mobile body The mobile body 100 is a vehicle provided as a power source for an engine, a motor, and the like, and is a four-wheeled vehicle in the present embodiment. The moving body 100 includes a vehicle body as a main body 102. The shock absorber 101 is arranged between the main body 102 (body body) and the axle. The shock absorber 101 suppresses the shaking of the main body 102 (vehicle body) by generating a damping force and suppressing the expansion / contraction operation of the spring.

The mobile body 100 includes a control device 103 mounted on the main body 102. The control device 103 is, for example, an ECU (Electronic Control Unit) mounted on the main body 102. The control device 103 is electrically connected to the coil 4 of the electromagnet device 1 and controls the energization of the coil 4. The damping force of the shock absorber 101 can be adjusted by the control device 103.

3. 3. Action effect In the electromagnet device 1 of the present embodiment described above, the fixed iron core 5 is welded to the inner peripheral surface 22 of the partition wall 21 of the housing 2 over the entire circumference, and is between the fixed iron core 5 and the partition wall 21. Is sealed. Therefore, in the electromagnet device 1 of the present embodiment, the sealing property of this portion can be ensured without providing a sealing member such as an O-ring between the fixed iron core 5 and the partition wall 21. Since the electromagnet device 1 of the present embodiment does not require a sealing member such as an O-ring, the cost of parts can be reduced by this amount.

Further, in the electromagnet device 1 of the present embodiment, each of the cap 7 and the fixed iron core 5 is welded to the tubular seal ring 8 over the entire circumference, and between the cap 7 and the seal ring 8 and the fixed iron core 5 The space between the seal rings 8 is sealed. Therefore, in the electromagnet device 1 of the present embodiment, a seal member such as an O-ring is not provided between the cap 7 and the seal ring 8 and between the fixed iron core 5 and the seal ring 8. Sex can be ensured. Therefore, in the electromagnet device 1 of the present embodiment, it is easy to further reduce the component cost.

Further, in the electromagnet device 1 of the present embodiment, since it is not necessary to provide the fixed iron core 5, the partition wall 21, the cap 7, and the seal ring 8 with a recess or the like for providing a seal member such as an O-ring, these structures are used. Can be simplified.

Further, in the electromagnet device 1 of the present embodiment, the space below the partition wall 21 of the housing 2 (first oil accommodating portion S1) and the space surrounded by the cap 7, the seal ring 8, and the fixed iron core 5 (the first). (Ii) Each of the oil accommodating portions S3) is a space in which oil is accommodating. However, in the electromagnet device 1 of the present embodiment, since each portion is sealed by welding, the sealing property is unlikely to deteriorate, and the sealing by welding is particularly effective.

Further, in the electromagnet device 1 of the present embodiment, the lower surface (surface 23) of the partition wall 21 and the lower surface (surface 54) of the fixed iron core 5 are flush with each other and are flat, so that the partition wall 21 and the fixed iron core 5 are flush with each other. It is easy to weld the part between and.

Further, in the electromagnet device 1 of the present embodiment, since the inner peripheral surface 22 of the partition wall 21 protruding inward from the peripheral wall portion 20 of the housing 2 and the fixed iron core 5 are welded, the welded portion is separated from the peripheral wall portion 20. Due to its location, welding work is easy.

Further, in the electromagnet device 1 of the present embodiment, there is a part of the partition wall 21 (step surface 221) behind the welded portion between the fixed iron core 5 and the partition wall 21, and the welded portion between the cap 7 and the seal ring 8 is provided. There is a part of the cap 7 (first outer peripheral surface 731) on the back side. Further, there is a part of the fixed iron core 5 (outer peripheral surface 520) behind the welded portion between the seal ring 8 and the fixed iron core 5. Therefore, in the electromagnet device 1 of the present embodiment, it is possible to prevent the laser beam from reaching an unnecessary portion and causing a problem when performing laser welding.

4. Modification Example Next, a modification of the electromagnet device 1, the shock absorber 101, and the moving body 100 of the present embodiment described above will be described.

The electromagnet device 1 may have a fixed iron core 5 welded to the inner peripheral surface of the housing 2 over the entire circumference, and the cap 7 and the fixed iron core 5 do not have to be welded to the seal ring 8. Good. A seal member such as an O-ring may be provided between each of the cap 7 and the fixed iron core 5 and the seal ring 8. Also in this case, the total number of sealing members included in the electromagnet device 1 can be reduced, and the component cost can be suppressed.

The space on the side of the housing 2 opposite to the movable core 6 from the fixed core 5 does not have to be an oil accommodating portion for accommodating oil, and may be a space accommodating a liquid or gas other than oil. ..

Further, the space surrounded by the fixed iron core 5, the cap 7, and the seal ring 8 does not have to be an oil accommodating portion for accommodating oil, and may be a space accommodating a liquid or gas other than oil.

The shaft 9 is not limited to a tubular shape, and may have a solid rod shape, and the first oil accommodating portion S1 and the second oil accommodating portion S3 may not be connected through the inside of the shaft 9.

The surface 54 of the fixed iron core 5 facing the opposite side of the movable iron core 6 is not limited to a flat surface, but may be a surface having irregularities.

The housing 2 does not have to have a partition wall 21, and a fixed iron core 5 may be provided so as to be in contact with the inner peripheral surface of the peripheral wall portion 20 of the housing 2. In this case, the fixed iron core 5 may be welded to the inner peripheral surface of the peripheral wall portion 20 over the entire circumference.

The lower surface (surface 23) of the partition wall 21 and the lower surface (surface 54) of the fixed iron core 5 do not have to be flush with each other, and may be arranged so as to form a step.

The lower surface (surface 23) of the partition wall 21 is not limited to a flat surface, and may be a surface having irregularities.

The welding of the fixed iron core 5 and the housing 2 and the welding of each of the cap 7 and the fixed iron core 5 and the seal ring 8 are not limited to laser welding, and may be welded by other welding means.

The electromagnet device 1 is not limited to the one that constitutes the shock absorber 101 of the moving body 100, and may be used for other purposes.

The moving body 100 is not limited to a four-wheeled vehicle, but may be a two-wheeled vehicle (motorcycle) or the like.

5. Summary As in the above-described embodiment and its modifications, the electromagnet device (1) of the first aspect has the following configuration.

That is, the electromagnet device (1) of the first aspect has a tubular housing (2), a bobbin (3) housed in the housing (2) and having a tubular portion (30), and a tubular portion (30). ), And a coil (4) wound around). The electromagnet device (1) is further housed in a fixed iron core (5) arranged on one side in the axial direction of the tubular portion (30) and a magnetic field generated in the tubular portion (30) when the coil (4) is energized. A movable iron core (6) that moves along the axial direction of the tubular portion (30) is provided. The fixed iron core (5) is welded to the inner peripheral surface of the housing (2) over the entire circumference.

In the electromagnet device (1) of the first aspect having the above configuration, the fixed iron core (5) and the housing (2) are formed by welding the fixed iron core (5) to the inner peripheral surface of the housing (2) over the entire circumference. Can be sealed between. As a result, in the electromagnet device (1) of the first aspect, the sealing property can be ensured without providing a sealing member such as an O-ring between the fixed iron core (5) and the housing (2).

Further, as in the above-described embodiment and its modification, the electromagnet device (1) of the second aspect additionally includes the following configuration in addition to the configuration of the first aspect.

That is, in the electromagnet device (1) of the second aspect, the cap (7) arranged on the side opposite to the fixed iron core (5) in the axial direction of the tubular portion (30), the cap (7), and the fixed iron core (5). ) Is further provided with a tubular seal ring (8). Each of the cap (7) and the fixed iron core (5) is welded to the seal ring (8) over the entire circumference.

By providing the above configuration, in the electromagnet device (1) of the second aspect, the space between the cap (7) and the seal ring (8) and the space between the seal ring (8) and the fixed iron core (5) are sealed by welding, respectively. can do. As a result, in the electromagnet device (1) of the second aspect, a sealing member such as an O-ring is placed between the cap (7) and the sealing ring (8) and between the sealing ring (8) and the fixed iron core (5). Even if it is not provided, the sealing property can be ensured.

Further, as in the above-described embodiment and its modification, the electromagnet device (1) of the third aspect additionally includes the following configuration in addition to the configuration of the second aspect.

That is, in the electromagnet device (1) of the third aspect, oil is stored in the internal space of the housing (2) on the side opposite to the movable iron core (6) with the fixed iron core (5) in the axial direction. It is the first oil accommodating part (S1) to be made. In the electromagnet device (1) of the third aspect, the space surrounded by the fixed iron core (5), the cap (7), and the seal ring (8) is the second oil storage portion (S3) in which the oil is stored.

By providing the above configuration, in the electromagnet device (1) of the third aspect, the oil in the first oil accommodating portion (S1) is prevented from entering through between the fixed iron core (5) and the housing (2). be able to. Further, in the electromagnet device (1) of the third aspect, the oil in the second oil accommodating portion (S3) is placed between the cap (7) and the seal ring (8), or between the seal ring (8) and the fixed iron core (5). ) Can be prevented from flowing out.

Further, as in the above-described embodiment and its modification, the electromagnet device (1) of the fourth aspect additionally includes the following configuration in addition to the configuration of the third aspect.

That is, the electromagnet device (1) of the fourth aspect further includes a tubular shaft (9) provided integrally with the movable iron core (6). The first oil accommodating portion (S1) and the second oil accommodating portion (S3) are connected to each other through the inside of the shaft (9).

By providing the above configuration, in the electromagnet device (1) of the fourth aspect, the oil in the first oil accommodating portion (S1) can be moved to the second oil accommodating portion (S3), and the second oil accommodating portion (S3) can be moved. It is easy to suppress the damping of the movable iron core (6) moving in the portion (S3) with oil.

Further, as in the above-described embodiment and its modification, the electromagnet device (1) of the fifth aspect additionally has the following configuration in addition to the configuration of any one of the first to fourth aspects. Be prepared.

That is, in the electromagnet device (1) of the fifth aspect, the surface (54) of the fixed iron core (5) facing the side opposite to the movable iron core (6) in the axial direction is a flat surface.

By providing the above configuration, in the electromagnet device (1) of the fifth aspect, the fixed iron core (5) and the housing (2) are compared with the case where the surface (54) of the fixed iron core (5) is a surface having irregularities. ) Is easy to weld.

Further, as in the above-described embodiment and its modification, the electromagnet device (1) of the sixth aspect additionally has the following configuration in addition to the configuration of any one of the first to fifth aspects. Be prepared.

That is, in the electromagnet device (1) of the sixth aspect, the housing (2) has a tubular peripheral wall portion (20) and a partition wall (20) that protrudes inward from the peripheral wall portion (20) and is annular when viewed in the axial direction. 21) and. The inner peripheral surface (22) of the partition wall (21) is the surface to which the fixed iron core (5) is welded.

By providing the above configuration, in the electromagnet device (1) of the sixth aspect, the welded portion (inner peripheral surface 22 of the partition wall 21) between the fixed iron core (5) and the housing (2) is the peripheral wall of the housing (2). Since it is separated from the part (20), welding work is easy.

Further, as in the above-described embodiment and its modification, the electromagnet device (1) of the seventh aspect additionally includes the following configuration in addition to the configuration of the sixth aspect.

That is, in the electromagnet device (1) of the seventh aspect, of the partition wall (21), the surface (23) facing the opposite side of the movable iron core (6) in the axial direction and the fixed iron core (5). The surface (54) facing the opposite side of the movable iron core (6) in the axial direction is flush with each other.

By providing the above configuration, in the electromagnet device (1) of the seventh aspect, the surface (23) of the partition wall (21) and the surface (54) of the fixed iron core (5) are flush with each other, so that the welding work can be performed. It's easy to do.

Further, as in the above-described embodiment and its modification, the shock absorber (101) of the eighth aspect includes the electromagnet device (1) of any one of the first to seventh aspects and the damping mechanism (13). And. The damping mechanism (13) generates a damping force of a magnitude corresponding to the movement of the movable iron core (6) of the electromagnet device (1).

By providing the above configuration, the shock absorber (101) of the eighth aspect is configured to include an electromagnet device (1) capable of ensuring sealing performance without providing a sealing member such as an O-ring. Can be done.

Further, as in the above-described embodiment and its modification, the moving body (100) of the ninth aspect includes the shock absorber (101) of the eighth aspect and the main body (102) provided with the shock absorber (101). And.

By providing the above configuration, the moving body (100) of the ninth aspect is configured to include an electromagnet device (1) capable of ensuring sealing performance without providing a sealing member such as an O-ring. Can be done.

Although the present disclosure has been described above based on the embodiments shown in the accompanying drawings, the present disclosure is not limited to the above-described embodiments, and appropriate design changes can be made within the scope of the present disclosure. Is.

1 Electromagnet device 2 Housing 21 Partition wall 22 Inner peripheral surface 23 Surface 3 Bobbin 30 Cylinder 4 Coil 5 Fixed iron core 54 Surface 6 Movable iron core 7 Cap 8 Seal ring 9 Shaft 13 Damping mechanism 100 Moving body 101 Shock absorber 102 Main body S1 First 1 Oil storage part S3 2nd oil storage part

Claims (9)

With a tubular housing
A bobbin housed in the housing and having a tubular portion,
The coil wound around the cylinder and
A fixed iron core arranged on one side of the cylinder in the axial direction,
A movable iron core housed in the cylinder portion and moved along the axial direction of the cylinder portion by a magnetic field generated when the coil is energized is provided.
The fixed iron core is welded to the inner peripheral surface of the housing over the entire circumference.
Electromagnet device. A cap arranged on the side of the cylinder portion in the axial direction opposite to the fixed iron core,
Further provided with a tubular seal ring for connecting the cap and the fixed iron core.
Each of the cap and the fixed iron core is welded to the seal ring all around.
The electromagnet device according to claim 1. In the housing, the internal space on the side opposite to the movable iron core with the fixed iron core sandwiched in the axial direction is a first oil accommodating portion in which oil is stored.
The space surrounded by the fixed iron core, the cap, and the seal ring is a second oil accommodating portion for accommodating oil.
The electromagnet device according to claim 2. Further provided with a tubular shaft provided integrally with the movable iron core,
The first oil accommodating portion and the second oil accommodating portion are connected to each other through the inside of the shaft.
The electromagnet device according to claim 3. Of the fixed cores, the surface facing the side opposite to the movable core in the axial direction is a flat surface.
The electromagnet device according to any one of claims 1 to 4. The housing is
Cylindrical peripheral wall and
It has an annular partition wall that protrudes inward from the peripheral wall portion and is viewed in the axial direction.
The inner peripheral surface of the partition wall is the surface to which the fixed iron core is welded.
The electromagnet device according to any one of claims 1 to 5. The surface of the partition wall facing the side opposite to the movable iron core in the axial direction and the surface of the fixed iron core facing the side opposite to the movable iron core in the axial direction are flush with each other.
The electromagnet device according to claim 6. The electromagnet device according to any one of claims 1 to 7.
A damping mechanism that generates a damping force of a magnitude corresponding to the movement of the movable iron core of the electromagnet device is provided.
shock absorber. The shock absorber according to claim 8 and
A mobile body including a main body provided with the shock absorber.

Images